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function keyDown(){
  //ÆÁ±ÎÊó±êÓÒ¼ü¡¢Ctrl+n¡¢shift+F10¡¢F5ˢС¢Í˸ñ¼ü
   //alert("ASCII´úÂëÊÇ£º"+event.keyCode);
   if ((window.event.altKey)&&
    ((window.event.keyCode==37)||   //ÆÁ±Î Alt+ ·½Ïò¼ü ←
     (window.event.keyCode==39))){  //ÆÁ±Î Alt+ ·½Ïò¼ü →
   alert("²»×¼ÄãʹÓÃALT+·½Ïò¼üǰ½ø»òºóÍËÍøÒ³£¡");
   event.returnValue=false;
   }
   if ((event.keyCode==8)  ||                 //ÆÁ±ÎÍ˸ñɾ³ý¼ü
    (event.keyCode==116)||                 //ÆÁ±Î F5 ˢмü
    (event.keyCode==112)||                 //ÆÁ±Î F1 ˢмü
    (event.ctrlKey && event.keyCode==82)){ //Ctrl + R
   event.keyCode=0;
   event.returnValue=false;
   }
   if ((event.ctrlKey)&&(event.keyCode==78))   //ÆÁ±Î Ctrl+n
   event.returnValue=false;
   if ((event.shiftKey)&&(event.keyCode==121)) //ÆÁ±Î shift+F10
   event.returnValue=false;
   if (window.event.srcElement.tagName == "A" && window.event.shiftKey)
    window.event.returnValue = false;  //ÆÁ±Î shift ¼ÓÊó±ê×ó¼üпªÒ»ÍøÒ³
   if ((window.event.altKey)&&(window.event.keyCode==115)){ //ÆÁ±ÎAlt+F4
    window.showModelessDialog("about:blank","","dialogWidth:1px;dialogheight:1px");
    return false;}
}
document.onkeydown=keyDown;
<body oncontextmenu="window.event.returnValue=false" onselectstart="return false">
document.onselectstart=new Function("self.event.returnValue=false");


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parseInt(string)
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cloneNode(true/false)
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function Search(){
//Èç¹ûǰһ¸ö¿Ø¼þµÄÖµ´óÓÚºóÒ»¸ö¿Ø¼þµÄÖµ(ǰÌáÊǺóÒ»¸ö¿Ø¼þ²»ÊÇ¿Õ,¿ÕµÄÇé¿öϲ»×öÈκδ¦Àí)
 if(document.forms[0].koteifrom.value > document.forms[0].koteiTo.value && document.forms[0].koteiTo.value != ""){
  alert('messageÄÚÈÝ');
  var koteifrom ......

Javascript ÅжÏä¯ÀÀÆ÷

                var Sys = {};
                var ua = navigator.userAgent.toLowerCase();
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